CN114815138B - Imaging lens group and optical identification system - Google Patents

Abstract

The invention discloses an imaging lens group of an optical identification system, which has a field of view (FOV) greater than 120 degrees and defines a radial direction and an axial direction that are perpendicular to each other. The imaging lens group includes a plurality of optical lenses from the object side to the image side. The optical lens closest to the object side among the optical lenses includes: an optical zone object-side surface and an optical zone image-side surface; a non-optical zone object-side surface surrounding the optical zone object-side surface; a non-optical zone image A side surface surrounding the image-side surface of the optical zone; and a first connecting portion disposed between the image-side surface of the optical zone and the image-side surface of the non-optical zone, wherein the tangential direction of a surface of the first connecting portion There is a first included angle with the radial direction, and the first included angle is between 15 degrees and 50 degrees. The invention is designed with a connection part between the image side surface of the optical zone and the image side surface of the non-optical zone to avoid unnecessary ghosting caused by stray light during imaging, thereby improving image quality and increasing the recognition of the optical recognition system. Spend.

Description

Imaging lens group and optical identification system

Technical field

The present invention relates to an imaging lens group, and more specifically, to a structure of an imaging lens group for eliminating stray light in an optical identification system.

Background technique

The biometric system, which is based on the unique biological characteristics of each creature, is often used because of its uniqueness, universality, permanence, measurability, convenience, acceptability, and indestructibility. It can be used on existing mobile devices on the market, and even on electronic devices with many applications, such as fingerprint recognition, vein recognition, face recognition, palmprint recognition, iris recognition, retina recognition, etc.

The optical identification lens in biometric identification system technology is a traditional biometric identification system that uses optical imaging principles. The current problems to be solved are not only the excessive size of the traditional biometric identification system, but also the need to improve resolution and image quality.

Usually, optical identification devices use plastic optical lens components to effectively reduce the manufacturing cost of imaging optical lens components. Conventional plastic optical lens assemblies are typically formed by injection molding and have smooth and bright surfaces characterized by high reflectivity. Therefore, when stray light is reflected from the surface of other optical components of the imaging optical lens assembly to the surface of the plastic optical lens assembly, the stray light reflected from the surface of the plastic optical lens assembly cannot be effectively attenuated and will be incident into the imaging lens the surface of the image sensing component.

Figure 1 is a schematic diagram of the application of an optical identification system for a three-piece lens set. Taking the optical identification system 9 of a three-piece lens set as an example, its structure includes a cover 91 arranged in sequence along the optical axis I from the object side to the image side, a first optical lens 921, a light shielding component 924, a second optical Lens 922 and third optical lens 923. The light first passes through the cover 91, the first optical lens 921, the light shielding component 924, the second optical lens 922 and the third optical lens 923, and then passes through the filter 925, so that the light reaches the image sensing component 93. In this way, the image sensing component 93 receives the imaging beam from the object to be measured.

The first optical lens 921 has a non-optical area object-side surface 9211, a non-optical area image-side surface 9213, an optical area object-side surface 9212 surrounded by the non-optical area object-side surface 9211 and allowing imaging light to pass, and The optical zone image side surface 9213 surrounds and allows the imaging light to pass through the optical zone image side surface 9214. The second optical lens 922 has a non-optical area object-side surface 9221, a non-optical area image-side surface 9223, an optical area object-side surface 9222 surrounded by the non-optical area object-side surface 9221 and allowing imaging light to pass, and The optical zone image side surface 9223 surrounds and allows the imaging light to pass through the optical zone image side surface 9224. The third optical lens 923 has a non-optical area object-side surface 9231, a non-optical area image-side surface 9233, an optical area object-side surface 9232 that is surrounded by the non-optical area object-side surface 9231 and allows imaging light to pass, and is surrounded by the non-optical area object-side surface 9231 and allows imaging light to pass through. The optical zone image side surface 9233 surrounds and allows the imaging light to pass through the optical zone image side surface 9234. The light shielding component 924 is installed at a position between the non-optical area image-side surface 9213 of the first optical lens 921 and the non-optical area object-side surface 9221 of the second optical lens 922 .

However, as shown in FIG. 2 , the light is between the cover 91 and the first optical lens 912 , and part of the light will pass through the cover 91 and the first optical lens 921 because the non-optical area image side surface The relationship of 9213 is thus further reflected. In particular, the light path of stray light will enter the image sensing component sequentially along the arrow directions L1, L2, and L3, thereby generating ghost images and reducing the recognition of the optical recognition system.

Therefore, how to meet the requirement of eliminating stray light between the cover plate and the optical lenses has become one of the important issues, so as to improve the image quality, increase the recognition, and meet the requirements of high-end recognition lenses.

Contents of the invention

The object of the present invention is to provide a connection part designed between the image side surface of the optical area and the image side surface of the non-optical area to avoid unnecessary ghosts caused by stray light during imaging, thereby improving image quality. , increase the recognition of the optical identification system.

In order to solve the above problems, the present invention provides an imaging lens group, which has a field of view (FOV) greater than 120 degrees and defines a radial direction and an axial direction that are perpendicular to each other. The imaging lens group is from the object side to the image side. It includes a plurality of optical lenses, wherein the optical lens closest to the object side among the optical lenses includes: an optical zone object side surface and an optical zone image side surface; a non-optical zone object side surface surrounding the optical zone object side surface; a non-optical area image-side surface surrounding the optical area image-side surface; and a first connecting portion disposed between the optical area image-side surface and the non-optical area image-side surface; wherein the first connecting portion There is a first included angle between the tangential direction of a surface and the radial direction, and the first included angle is between 15 degrees and 50 degrees.

Optionally, the first included angle is between 25 degrees and 40 degrees.

Optionally, the field of view angle is greater than 130 degrees.

Optionally, the connection between the first connecting portion and the image side surface of the optical zone forms a first rounded corner, and the radius of curvature of the first rounded corner is between 0.03mm and 0.15mm.

Optionally, the connection between the first connecting portion and the image side surface of the optical zone forms a first rounded corner, and the radius of curvature of the first rounded corner is between 0.055mm and 0.1mm.

Optionally, the thickness of the first connecting portion along the axial direction accounts for 5% to 20% of the thickness of the optical lens along the axial direction.

Optionally, the distance along the axial direction between the object-side surface of the optical zone and the connection point having the first rounded corner is between 0.4 mm and 1.0 mm.

Optionally, a connection between the first connection part and the image side surface of the non-optical area forms a second rounded corner, and the radius of curvature of the second rounded corner is between 0.03 mm and 0.15 mm.

Optionally, the surface of the first connecting part is a first inclined surface, and the first inclined surface is annular around the axial direction and surrounds the image side surface of the optical zone.

Optionally, it further includes: a second connecting part disposed between the first connecting part and the image side surface of the non-optical area, wherein a surface of the second connecting part is a convex surface, and the convex surface rotates around the axis It is annular and surrounds the first inclined surface.

Optionally, the radius of curvature of the convex surface of the second connecting portion is between 1.2 mm and 3.0 mm.

Optionally, it further includes: a second connection part disposed between the first connection part and the non-optical area image side surface, wherein a surface of the second connection part is a second slope, and the second The inclined surface is annular around the axial direction and surrounds the first inclined surface.

Optionally, there is a second included angle between the tangential direction of the surface of the second connecting portion and the radial direction, and the second included angle is between 15 and 50 degrees.

The invention further provides an optical identification system, which includes from the object side to the image side: a cover plate, the above-mentioned imaging lens group and an image sensing component.

According to the optical identification system of the present invention, a connection part is designed between the optical area image side surface and the non-optical area image side surface of the optical lens, and the connection part eliminates the problem in the form of a bevel, a rounded corner, a convex surface or multiple bevels, for example. The stray light between the cover plate and the optical lens can prevent the stray light from causing unnecessary ghosting during imaging, thereby improving the image quality and increasing the recognition of the optical identification system.

Description of the drawings

Figure 1 is a schematic diagram of the application of an optical identification system of a three-piece lens set in the prior art.

FIG. 2 is a schematic diagram of light reflection between the cover plate and the optical lens of the prior art in FIG. 1 .

Figure 3a is a schematic diagram of the implementation and application of the identification system according to an embodiment of the present invention.

Figure 3b is a schematic diagram of the implementation and application of the identification system according to another embodiment of the present invention.

4 is a schematic cross-sectional view of an optical lens according to the first embodiment of the present invention.

FIG. 5 is a schematic diagram of light reflection between the cover plate and the optical lens of the present invention in FIG. 4 .

FIG. 6 is a schematic cross-sectional view of an optical lens according to a second embodiment of the present invention.

7 is a schematic cross-sectional view of an optical lens according to a third embodiment of the present invention.

Explanation of symbols in the drawings:

1 Optical identification system;

11 cover;

12 imaging lens group;

121 First optical lens;

121’ first optical lens;

121’’ first optical lens;

1211 Non-optical area object-side surface;

1212 Object-side surface of optical zone;

1213 Non-optical area image side surface;

1214 Optical zone image side surface;

1215 first connection part;

1215'' first connection part;

1216 surface;

1216'' surface;

1217’ Second connection;

1217''Second connection part;

1218’ surface;

1218'' surface;

1219 bevel;

1219’ Convex;

12191 first slope;

12192 Second slope;

122 Second optical lens;

1221 Non-optical area object-side surface;

1222 Object-side surface of optical zone;

1223 Non-optical area image side surface;

1224 optical zone image side surface;

123 Third optical lens;

1231 Non-optical area object-side surface;

1232 Object-side surface of optical zone;

1233 Non-optical area image side surface;

1234 Optical zone image side surface;

124 Shading components;

125 filters;

126 lens barrel;

13 image sensing components;

9 Optical identification system;

91 cover;

921 First optical lens;

9211 Non-optical area object-side surface;

9212 Object-side surface of optical zone;

9213 Non-optical area image side surface;

9214 Optical zone image side surface;

922 Second optical lens;

9221 Non-optical area object-side surface;

9222 Object-side surface of optical zone;

9223 Non-optical area image side surface;

9224 Optical zone image side surface;

923 third optical lens;

9231 Non-optical area object-side surface;

9232 Object-side surface of optical zone;

9233 Non-optical area image side surface;

9234 Optical zone image side surface;

924 Shading components;

925 filter;

93 image sensing components;

D thickness;

d thickness;

d1 distance;

I optical axis;

L1, L2, L3 arrow directions;

R1 first fillet;

R2 second fillet;

T1 radial;

T2 axial;

T3 tangential direction;

θ angle.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only Some embodiments of the present invention, but not all embodiments. However, for the description of the present disclosure, the detailed description may be omitted if it is determined that the detailed description makes the embodiments of the present disclosure unclear. Portions that are not relevant to the description are omitted in order to specifically describe the present disclosure, and the same reference numerals refer to the same components throughout the specification.

In the embodiments, the same or similar components will be given the same or similar numbers, and their redundant description will be omitted. In addition, features in different exemplary embodiments can be combined with each other without conflict, and simple equivalent changes and modifications made in accordance with this specification or the scope of the patent application are still within the scope of this patent. In addition, terms such as “first” and “second” mentioned in this specification or the scope of the patent application are only used to name discrete components or to distinguish different embodiments or scopes, and are not used to limit the upper or lower limit on the number of components. , nor is it intended to limit the manufacturing sequence or installation sequence of components.

Please refer to FIG. 3a, which is a schematic diagram of the implementation of an optical identification system according to an embodiment of the present invention. The present invention is the structure of an imaging lens group of an optical identification system. Taking an optical identification system of a three-piece lens group as an example, the optical identification system 1 includes a sequence of components along the optical axis I from the object side to the image side. The cover plate 11, the imaging lens group 12 and the image sensing component 13 are arranged. The imaging lens group 12 of the present invention can be regarded as an ultra-wide-angle imaging lens, which has a field of view (FOV, Field of View) that can be greater than 120 degrees, 130 degrees, 140 degrees, or 150 degrees, etc. The imaging lens group 12 includes a first optical lens 121 , a light shielding component 124 , a second optical lens 122 and a third optical lens 123 and an optical filter 125 (such as an infrared filter) arranged sequentially along the optical axis I from the object side to the image side. film, infrared bandpass filter or other light band filter, etc.). The light passes through the first optical lens 121, the light shielding component 124, the second optical lens 122 and the third optical lens 123, and passes through the filter 125, so that the light reaches the image sensing component 13, causing the image to be sensed. The measuring component 13 receives the imaging beam from the object to be measured. It should be added that the number of these optical lenses is not limited in the application of the embodiment. Please refer to FIG. 3b. In another embodiment, the imaging lens assembly 12 further includes: a lens barrel 126 for accommodating a plurality of optical lenses (such as the first optical lens 121, the light shielding component 124, the second Optical lens 122 and the third optical lens 123) and the light shielding component. The light shielding component 124 can be an aperture stop (Aperture stop) or a stop (Stop) used to correct edge light, but is not limited to the above.

The first optical lens 121 includes: a non-optical area object-side surface 1211, an optical area object-side surface 1212 surrounded by the non-optical area object-side surface 1211, a non-optical area image-side surface 1213, and a non-optical area image-side surface 1213. The optical zone surrounded by side surface 1213 is like side surface 1214 . The second optical lens 122 includes: a non-optical area object-side surface 1221, an optical area object-side surface 1222 surrounded by the non-optical area object-side surface 1221, a non-optical area image-side surface 1223, and a non-optical area image-side surface 1223. The optical zone surrounded by side surface 1223 is like side surface 1224 . The third optical lens 123 includes: a non-optical area object-side surface 1231, an optical area object-side surface 1232 surrounded by the non-optical area object-side surface 1231, a non-optical area image-side surface 1233, and a non-optical area image-side surface 1233. The optical zone surrounded by side surface 1233 is like side surface 1234 .

The object-side surfaces 1212, 1222, and 1232 of the optical zone are lens surfaces that face the object side (or the object to be measured) and allow the imaging beam to pass through, while the image-side surfaces 1214, 1224, and 1234 of the optical zone are facing the image side (or imaging surface). ) and allows the imaging beam to pass through the lens surface.

The cover 11 is used to protect the components located below it. In the application of the embodiment, the cover plate 11 is a protective flat plate. During biometric identification, the surface of the cover 11 is in contact with the object to be measured. In other words, the object to be tested contacts the surface of the cover 11 for biometric identification. The protective plate may include a light-transmitting or semi-transparent body to facilitate the transmission of the imaging light beam to the image sensing component 13 . The source of the light beam may be external light or light provided below the cover 11 . The main body of the protective plate may include a glass plate, a plastic plate, or a combination of the above two, but is not limited thereto. In addition, the protective plate may optionally include a decorative layer, which is disposed on the cover 11 to hide components below it that are not intended to be seen.

In the application of the embodiment, the cover 11 may further include a display panel, a touch panel, or a combination of at least two of the above. For example, the cover 11 can be a display panel, such as an organic light-emitting display panel or a liquid crystal display panel, but is not limited thereto. Alternatively, the cover 11 may be a touch panel, such as a panel having a plurality of touch electrodes. The plurality of touch electrodes may be formed on the outer surface of the panel or embedded in the panel, and the plurality of touch electrodes may perform touch detection through self-capacitance or mutual capacitance. Alternatively, the cover 11 may be a combination of a protective flat panel and a display panel or a combination of a protective flat panel and a touch panel.

The light shielding component 124 can be disposed between the object to be viewed and the imaging surface. As in the embodiment of the present invention, in the optical identification system 1, the light shielding component 124 is located on the non-optical area image side surface 1213 of the first optical lens 121. , the first optical lens 121 is used to expand the field of view (FOV, Field Of View) of image capturing, so that the image sensing component 13 can capture a larger image range. In this embodiment, the first optical lens 121 has negative refractive power. In addition, the object-side surface 1212 of the optical zone of the first optical lens 121 is concave at the paraxial axis, and the image-side surface 1214 of the optical zone of the first optical lens 121 is concave at the paraxial axis. The first optical lens 121, the second optical lens 122 and the third optical lens 123 can be made of plastic material to meet the requirement of lightweight, but are not limited thereto.

The light shielding component 124 is used to shield stray light to improve image quality. In this embodiment, the light shielding component 124 is disposed between the non-optical area image-side surface 1213 of the first optical lens 121 and the non-optical area object-side surface 1221 of the second optical lens 122 .

The second optical lens 122 is used to correct the aberration generated by the first optical lens 121 and help reduce the occurrence of spherical aberration to improve imaging quality. In addition, the object-side surface 1222 of the optical zone of the second optical lens 122 is convex at the paraxial axis, and the image-side surface 1224 of the optical zone of the second optical lens 122 is convex at the paraxial axis.

The third optical lens 123 is also used to correct aberrations and help reduce the occurrence of spherical aberration to improve imaging quality. In addition, in the application of the embodiment, multiple optical lenses (such as the second optical lens 122 and the third optical lens 123) are used to jointly correct aberrations. In addition to effectively correcting aberrations, it can also reduce the cost of correcting the image. The manufacturing difficulty of each optical lens is poor. In addition, the object-side surface 1232 of the optical zone of the third optical lens 123 is convex at the paraxial axis, and the image-side surface 1234 of the optical zone of the third optical lens 123 is convex at the paraxial axis.

The filter 125 is used to separate and filter light. The image sensing component 13 converts the light passing through the filter 125 into digital signals of image data. In the application of the embodiment, the optical zone image side surface 1234 of the third optical lens 123 can be coated with a filter material of a specific light wavelength to replace the aforementioned filter 125, but is not limited to the third optical lens 123. The optical lens can also be coated on the first lens or the second lens.

4 is a schematic cross-sectional view of an optical lens according to the first embodiment of the present invention. Please refer to Figure 4 and Figure 3. The optical lens of the present invention is illustrated by taking the first optical lens 121 as an example. The first optical lens 121 is the optical lens closest to the object side among these optical lenses, and is defined with mutually perpendicular Radial direction T1 and axial direction T2, the axial direction T2 is parallel to the optical axis I. The optical zone image side surface 1214 of the first optical lens 121 is concave at the paraxial axis. The first optical lens 121 further includes: a first connection portion 1215 disposed between the optical area image side surface 1214 and the non-optical area image side surface 1212. For example, a bevel portion is formed between the non-optical area image side surface 1213 and the optical area image side surface 1214 of the first optical lens 121, and a surface 1216 of the first connecting portion 1215 is an inclined surface 1219 of the bevel portion, The inclined surface 1219 is annular around the axial direction and surrounds the image side surface 1214 of the optical zone.

The angle θ between the tangential direction T3 (toward the optical axis) of the surface 1216 of the first connecting portion 1215 and the radial direction T1 (toward the optical axis) may be between 15 degrees and 50 degrees. Preferably, the angle θ Between 20 degrees and 40 degrees. The connection between the first connecting portion 1215 and the optical zone image side surface 1214 forms a first arc angle R1. The curvature radius of the first arc angle R1 can be between 0.03mm and 1.50mm. Preferably, the radius of curvature of the first fillet R1 is between 0.055mm and 0.1mm. The connection between the first connecting portion 1215 and the non-optical area image-side surface 1213 forms a second arc angle R2. The curvature radius of the second arc angle R2 can be between 0.03mm and 0.15mm. Preferably, the radius of curvature of the second rounded corner R2 is between 0.055mm and 0.1mm.

In the application of the embodiment, the thickness d of the first connecting portion 1215 along the axial direction T2 accounts for 5% to 20% of the thickness D of the first optical lens 121 along the axial direction T2, that is, the thickness d of the oblique section. Accounting for 5% to 20% of the overall thickness D of the first optical lens 121 . Preferably, the thickness d of the first connecting portion 1215 along the axial direction T2 accounts for 10% to 16% of the thickness D of the first optical lens 121 along the axial direction T2. For example, when the D value is 0.7435mm and the d value is 0.1005mm, the ratio of d value to D value is approximately 13.5%. Furthermore, the distance d1 between the object-side surface 1212 of the optical area of the first optical lens 121 and the connection point having the first rounded corner R1 along the axial direction T2 is between 0.4 mm and 1.0 mm. .

Please refer to Figure 5 and Figure 3a. When light passes between the cover 11 and the first optical lens 121, part of the light will pass through the cover 11 and the first optical lens 121 because the non-optical area image side surface 1213 The relationship is thus further reflected. However, because the surface 1216 of the first connection portion 1215 between the non-optical area image side surface 1213 and the optical area image side surface 1214 is a slope 1219, the light path of the stray light will be sequentially diverted along the arrow directions L1 and L2. Reflected off the first optical lens 121 . In this embodiment, light is reflected in a bevel manner, so that stray light cannot enter the image sensing component 13 through multiple reflections, thereby avoiding ghosting.

FIG. 6 is a schematic cross-sectional view of an optical lens according to a second embodiment of the present invention. Please refer to Figure 6 and Figure 3a. The first optical lens 121' of the second embodiment is generally similar to the first optical lens 121 of the first embodiment, and similar components are marked with similar numbers. The difference between the first optical lens 121' of the second embodiment and the first optical lens 121 of the first embodiment is that the first optical lens 121' further includes an image side of the first connecting portion 1215 and the non-optical area. A second connecting portion 1217' between the surfaces 1213, a surface 1218' of the second connecting portion 1217' is a convex surface 1219', and the convex surface 1219' is annular around the axis T2 and surrounds the inclined surface 1215. The curvature radius of the convex surface 1219' of the second connecting portion 1217' is between 1.2 mm and 3.0 mm. In application, in addition to refracting light in a bevel manner to prevent stray light from passing through the light-shielding component 124 and entering the image sensing component 13 through multiple reflections, an arc-shaped convex surface (the second connection) is also formed with a large curvature radius. The surface 1218' of the portion 1217') reflects and refracts light through the arc-shaped convex surface, so that stray light cannot enter the image sensing component 13 through multiple reflections, thereby avoiding ghosting.

7 is a schematic cross-sectional view of an optical lens according to a third embodiment of the present invention. Referring to FIG. 7 and FIG. 3 , the first optical lens 121 ″ of the third embodiment is generally similar to the first optical lens 121 of the first embodiment, and similar components are marked with similar numbers. The difference between the first optical lens 121 ″ of the second embodiment and the first optical lens 121 of the first embodiment is that the image side surface 1214 of the optical zone is concave at the paraxial axis, and the first connecting part 1215 ″ is A first groove (such as a V-shaped groove), and the surface 1216'' of the first connecting part 1215'' has a first slope 12191 of the first groove, and the first slope 12191 is around the axial direction T2 It is annular and surrounds the image side surface 1214 of the optical zone. The first optical lens 121'' further includes a second connection part 1217'' disposed between the first connection part 1215'' and the non-optical area image side surface 1213. The second connection part is a second groove. (such as a V-shaped groove), and a surface 1218'' of the second connecting part 1217'' is a second slope 12192 of the second groove. The second slope 12192 is annular around the axial direction and surrounds The first slope 12191. For example, the first connection part 1215'' and the second connection part 1217'' are illustrated with two V-shaped grooves. The first slope 12191 in the V-shaped grooves (the first connection part 1215'' The first and second included angles between the tangent direction of the surface 1216'') and the second inclined surface 12192 (the surface 1218'' of the second connecting portion 1217'') and the radial direction are between 15 degrees and 50 degrees. between. The definition of the first and second included angles is similar to the definition of the included angle θ shown in FIG. 4 . In the application of the embodiment, wavy grooves and bevels are used to reflect light, so that stray light cannot enter the image sensing component 13 through multiple reflections, thereby avoiding ghosting.

According to the optical identification system of the present invention, a connection part is designed between the optical area image side surface and the non-optical area image side surface of the optical lens, and the connection part eliminates the problem in the form of a bevel, a rounded corner, a convex surface or multiple bevels, for example. The stray light between the cover plate and the optical lens can prevent the stray light from causing unnecessary ghosting during imaging, thereby improving the image quality and increasing the recognition of the optical identification system.

The above are only preferred embodiments of the present invention, and should not be used to limit the scope of the present invention. That is, any simple equivalent changes and modifications made based on the patent scope of the present invention and the description of the invention will still be considered. It is within the scope covered by the patent of this invention.

Claims (8)

1. An imaging lens assembly having an angle of view of greater than 120 degrees and defining a radial direction and an axial direction perpendicular to each other, the imaging lens assembly comprising a plurality of optical lenses from an object side to an image side, wherein an optical lens closest to the object side of the plurality of optical lenses comprises:

an optical zone object side surface and an optical zone image side surface;

a non-optical zone object side surface surrounding the optical zone object side surface;

a non-optical area image side surface surrounding the optical area image side surface; and

a first connecting part arranged between the optical zone image side surface and the non-optical zone image side surface;

wherein a first included angle is formed between a tangential direction of a surface of the first connecting portion and the radial direction, and the first included angle is between 15 degrees and 50 degrees;

the first connecting part and the connecting part of the image side surface of the optical area form a first round angle, and the curvature radius of the first round angle is between 0.03mm and 0.15 mm;

the surface of the first connecting part is a first inclined plane, and the first inclined plane is annular around the axial direction and surrounds the image side surface of the optical area;

the second connecting part is arranged between the first connecting part and the image side surface of the non-optical area, wherein one surface of the second connecting part is a convex surface, and the convex surface is annular around the axial direction and surrounds the first inclined surface; and

the convex radius of curvature of the second connection portion is between 1.2mm and 3.0 mm.

2. The imaging lens assembly of claim 1 wherein said first included angle is between 25 degrees and 40 degrees.

3. The imaging lens assembly of claim 1 wherein the field angle is greater than 130 degrees.

4. The imaging lens assembly of claim 1 wherein the radius of curvature of the first rounded corner is between 0.055mm and 0.1 mm.

5. The imaging lens assembly of claim 1, wherein a thickness of said first connecting portion in said axial direction is 5% to 20% of a thickness of said optical lens in said axial direction.

6. The imaging lens assembly of claim 1, wherein a distance between said object-side surface of said optical zone and said junction with said first rounded corner along said axial direction is between 0.4mm and 1.0 mm.

7. The imaging lens assembly of claim 1, wherein a second rounded corner is formed at a junction of the first connecting portion and the image side surface of the non-optical region, and a radius of curvature of the second rounded corner is between 0.03mm and 0.15 mm.

8. An optical recognition system, comprising, in order from an object side to an image side:

a cover plate;

an imaging lens group as claimed in any one of claims 1 to 7, and

an image sensor assembly.